Launch of a Delta IV Heavy . ... Credit Copyright: Ben Cooper ( Launch Photography ) Explanation: It is the tallest rocket in active use. ... The resulting rocket, the most powerful in use by the US Air Force, is capable of lifting over 23,000 kilograms into low Earth orbit, comparable to NASA's Space Shuttle . ... The Delta IV Heavy has since completed several more successful lift-offs, while its next launch is currently planned from Vandenberg Air Force Base , California , USA, next month. ...